Receiver for use in an ultra-wideband communication system

a communication system and receiver technology, applied in the direction of digital transmission, electrical equipment, synchronisation arrangement, etc., can solve the problems of increasing the number and increasing the cost of power consumption of rake filter implementations. , to achieve the effect of avoiding unnecessary number proliferation

Active Publication Date: 2019-01-08
DECAWAVE
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

Furthermore, it is of no relevance in such systems which specific voltage levels are selected to represent each of the logic states.
One particular problem in multi-path, spread-spectrum systems, including UWB, is channel-induced noise present in the received signal.
Unfortunately, in known implementations of the UWB receiver, improvements in performance usually come at the expense of power.
However, known rake filter implementations tend to consume significantly more power than other prior art techniques.
We submit that prior art techniques for performing both carrier recovery and timing recovery in the digital domain are less than optimum.

Method used

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  • Receiver for use in an ultra-wideband communication system
  • Receiver for use in an ultra-wideband communication system
  • Receiver for use in an ultra-wideband communication system

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Embodiment Construction

[0051]Shown in FIG. 2 is a UWB receiver 10′ constructed in accordance with our invention. As in the prior art system shown in FIG. 1, the signal received by antenna 12 is continuously conditioned by filter 14. The conditioned signal is then periodically sampled by an analog-to-digital converter (“ADC”) 20 and provided as a continuous series of digital samples. In accordance with a preferred embodiment of our invention, ADC 20 is specially adapted to provide each digital sample in ternary form, i.e., [−1, 0, +1]. In view of the difficulty of currently available standard digital circuit technology efficiently to represent a 3-value variable in the form of a single ternary trit, we anticipate, at least in the near term, such variables will require representation using 2 conventional, binary bits, wherein a first one of the bits represents the numeric component of the variable, i.e., [0, 1], and the second bit represents the sign of the variable, i.e., [+, −]. In this regard, it could b...

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Abstract

In an ultra-wideband (“UWB”) receiver, a received UWB signal is periodically digitized as a series of ternary samples. During a carrier acquisition mode of operation, the samples are continuously correlated with a predetermined preamble sequence to develop a correlation value. When the value exceeds a predetermined threshold, indicating that the preamble sequence is being received, estimates of the channel impulse response (“CIR”) are developed. When a start-of-frame delimiter (“SFD”) is detected, the best CIR estimate is provided to a channel matched filter (“CMF”). During a data recovery mode of operation, the CMF filters channel-injected noise from the sample stream. Both carrier phase errors and data timing errors are continuously detected and corrected during both the carrier acquisition and data recovery modes of operation. In one embodiment, the carrier recovery and timing recovery are performed using just the carrier loop filter.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation-in-Part of U.S. application Ser. No. 15 / 135,383, filed 21 Apr. 2016 (“First Parent Application”).[0002]The First Parent Application is a Continuation-In-Part of application Ser. No. 13 / 775,282, filed 28 Mar. 2013 (“Second Parent Application”).[0003]The Second Parent Application is also a Continuation-In-Part of application Ser. No. 12 / 885,517, filed 19 Sep. 2010, now U.S. Pat. No. 8,437,432, issued 7 May 2013 (“First Parent Patent”), which is in turn also related to Provisional Application Ser. No. 61 / 316,299, filed 22 Mar. 2010 (“First Parent Provisional”).[0004]The First Parent Application is also a Continuation-In-Part of PCT Application Serial No. PCT / EP2013 / 070851, filed 7 Oct. 2013 (“Third Parent Application”).[0005]The Third Parent Application is a Continuation-In-Part of application Ser. No. 13 / 033,098, filed 23 Feb. 2011, now U.S. Pat. No. 8,436,758, issued 7 May 2013 (“Second Parent Patent”), w...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04L7/00H04W56/00H04B1/7163
CPCH04B1/71637H04L7/0016H04W56/0035H04L7/0029H04B1/7183
Inventor MCELROY, CIARANMCLAUGHLIN, MICHAEL
Owner DECAWAVE
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